Roller Conveyor Shot Blasting Machine for Steel Plate Pretreatment Line
1. Brief Profile
The Roller Conveyor Shot Blasting Machine for Steel Plate Pretreatment Lines is a high-performance industrial system designed to automate surface preparation for steel plates, coils, and flat metal components. Integrated into pretreatment lines, it removes rust, mill scale, and welding residues while enhancing surface roughness to improve paint adhesion and corrosion resistance.
This machine is engineered for continuous operation in heavy-duty environments, such as steel mills, shipbuilding yards, and automotive manufacturing plants. It features a robust roller conveyor system that transports steel plates through a blasting chamber, where high-velocity steel shots or abrasives are propelled by centrifugal turbines. The process ensures uniform cleaning, descaling, and edge rounding, meeting international standards like ISO 8501-1 (Sa2.5–Sa3).
Certified for safety (CE, ISO9001) and equipped with energy-efficient components, the machine reduces operational costs and environmental impact. Its modular design allows seamless integration with preheating, coating, and drying systems, making it ideal for large-scale steel pretreatment lines.
2. Application
The Roller Conveyor Shot Blasting Machine is critical in industries requiring stringent surface quality for steel plates. Key applications include:
Steel Plate Manufacturing:
Pretreatment of hot-rolled or cold-rolled steel plates (thickness: 2–50 mm) for structural steel, shipbuilding, and pressure vessel fabrication.
Removal of mill scale and surface defects to achieve a clean, profiled surface (Ra 40–80 μm) for optimal coating adhesion.
Shipbuilding and Offshore:
Surface preparation of hull plates, deck sections, and offshore structures to prevent corrosion in marine environments.
Cleaning of welded joints and edges to ensure high-quality welding and painting.
Automotive Industry:
Pretreatment of chassis components, frame rails, and body panels to enhance anti-corrosion coatings.
Edge rounding of laser-cut or stamped parts to reduce stress concentrations.
Construction and Infrastructure:
Cleaning of steel beams, columns, and bridges for structural integrity and longevity.
Surface profiling of pre-painted steel coils used in roofing and cladding systems.
Energy Sector:
Pretreatment of pipelines, storage tanks, and wind tower sections for oil, gas, and renewable energy projects.
Removal of oxide layers from high-strength steel plates used in pressure vessels.
Railway and Transportation:
Surface preparation of rail tracks, wagon bodies, and locomotive frames to resist wear and corrosion.
Cleaning of aluminum or stainless-steel components for lightweight train designs.
3. Features
The machine incorporates advanced features to optimize performance, efficiency, and safety:
Heavy-Duty Roller Conveyor System:
Double-chain-driven rollers with hardened surfaces to support steel plates weighing up to 10 tons per meter.
Adjustable roller spacing (300–1,500 mm) to accommodate plates of varying widths.
Variable speed control (0.5–5 m/min) for precise process timing.
High-Efficiency Blast Wheels:
Twin or quad centrifugal turbines (Ø380–600 mm) with direct-drive motors for abrasive velocities up to 100 m/s.
Curved vanes and alloy-lined housings to extend blade life (1,200–2,000 hours).
Adjustable throw angles (45°–90°) for targeted cleaning of plate surfaces and edges.
Abrasive Recycling System:
Screw conveyors and bucket elevators transport used abrasives to a multi-stage separator.
Air-wash technology removes dust and broken shots, ensuring consistent abrasive quality.
Automatic abrasive replenishment to maintain blasting intensity.
Dust Extraction and Filtration:
Pulse-jet bag-type dust collectors with >99.5% efficiency, compliant with EPA standards.
Optional cartridge filters for fine particle capture (≥1 μm).
Explosion-proof design for safety in flammable environments.
Modular Chamber Design:
Blasting chamber lined with Mn13 steel plates or rubber curtains to reduce wear and noise.
Segmented construction for easy maintenance and expansion.
Soundproofing panels to limit noise emissions (<85 dB).
Advanced Control System:
PLC-based interface with touchscreen HMI for real-time monitoring of blast parameters.
Automatic fault diagnosis and alarms for uninterrupted operation.
Data logging for quality control and process optimization.
Safety Enhancements:
Emergency stop buttons, interlock systems, and safety light curtains.
Rubber seals at entry/exit points to contain abrasives.
Fire suppression systems for high-risk applications.
Energy Efficiency:
Variable frequency drives (VFDs) to reduce power consumption during low-load operation.
Heat recovery systems for preheating abrasives or drying coated plates.
4. Main Parts
The machine consists of the following core components:
Blast Chamber:
Enclosed steel structure housing 2–8 blast wheels for uniform coverage of plate surfaces.
Lined with Mn13 wear plates or rubber sheets to protect against abrasive impact.
Roller Conveyor System:
Heavy-duty rollers (Ø150–300 mm) with hardened surfaces for durability.
Double-chain drive mechanism with gear motors for smooth plate movement.
Support frames with adjustable height for different plate thicknesses.
Blast Wheel Assembly:
High-speed turbines (2,900–3,200 RPM) with curved vanes for optimal abrasive projection.
Direct-drive motors (7.5–30 kW per wheel) for consistent performance.
Adjustable control cages to regulate abrasive flow and direction.
Abrasive Recycling System:
Horizontal screw conveyors to collect used abrasives from the chamber floor.
Bucket elevator with chain-driven buckets for vertical transport.
Air-wash separator with adjustable airflow to remove dust and fines.
Dust Collection Unit:
Pulse-jet bags or cartridge filters to capture fine particles.
Compressed air system for automatic bag cleaning.
Dust discharge chute for safe disposal.
Control Panel:
PLC-controlled operation with real-time monitoring of conveyor speed, blast intensity, and dust levels.
Touchscreen HMI for parameter adjustment and fault diagnostics.
Remote access capability for technical support.
Safety Accessories:
Rubber curtains and observation windows for operator visibility.
Soundproofing panels and vibration dampers to reduce noise.
Fire extinguishers and explosion-proof ventilation.
5. Basic Parameters
Parameter Specification
Model Range QPL8, QPL12, QPL16, QPL20
Workpiece Dimensions Width: 300–2,500 mm; Thickness: 2–50 mm; Length: ≤12 m
Conveyor Speed 0.5–5 m/min (adjustable)
Blast Wheel Power 2 × 15 kW to 8 × 30 kW (depending on model)
Abrasive Type Steel shots (S230–S780), stainless steel, or ceramic
Abrasive Capacity 2,000–8,000 kg
Dust Collector Capacity 20,000–50,000 m³/h (pulse-jet)
Noise Level ≤82 dB(A)
Power Supply 380V, 50Hz, 3-Phase
Total Weight 12,000–35,000 kg (depending on configuration)
Certifications CE, ISO9001, ISO14001, ATEX (for explosive environments)
Cleaning Efficiency ≥98% removal of mill scale (ISO 8501-1 Sa2.5–Sa3)
Surface Profile Ra 40–80 μm (adjustable via abrasive size and speed)
Conclusion
The Roller Conveyor Shot Blasting Machine for Steel Plate Pretreatment Lines is a state-of-the-art solution for industries demanding high-quality surface preparation. Its heavy-duty design, advanced abrasive recycling, and energy-efficient operation make it suitable for continuous production in steel mills, shipyards, and automotive plants. By ensuring uniform cleaning and profiling, the machine enhances coating adhesion, extends component lifespan, and reduces maintenance costs.
With modular construction and compliance with international standards, it offers flexibility for customization and integration into existing pretreatment lines. Whether for structural steel, shipbuilding, or energy infrastructure, this machine delivers reliability, efficiency, and environmental sustainability, making it an indispensable asset for modern industrial processes.
